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    <title>Document</title>
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    <script>
        let arr = ['1','20','-5','3'];
        console.log(arr);
        // arr = arr.map(function(item) {
        //     return parseInt(item);
        // });
        // console.log(arr);
        arr = arr.map(item => parseInt(item));
        console.log(arr);

        const arr1 = [1,20,-5,3];
        let result1 = arr1.reduce((a, b) => a + b);
        console.log(result1);
        let result2 = arr1.reduce((a, b) => a * b);
        console.log(result2);
        let result3 = arr1.reduce((a, b) => a * b, 0);
        console.log(result3);

        // 1、拷贝对象
        // ES6声明对象简写
        const age = 12
        const name = "Amy"
        // 传统
        const person1 = {age: age, name: name}
        console.log(person1)
        // ES6
        const person2 = {age, name}
        console.log(person2) //{age: 12, name: "Amy"}




    </script>
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